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• W2097536892 abstract "1. The objective of the study was to evaluate the functional effects of reflexes on muscle mechanics during natural voluntary movements. The excitability of the H (Hoffmann) reflex was used as a measure of the excitability of the central component of the stretch reflex. 2. We recorded EMG, ground reaction forces and the H reflex in the soleus muscle in humans while landing from a downward jump, during drop jumping and during hopping. The movements were also recorded by high-speed cinematography. 3. The EMG pattern was adapted to the motor task. When landing the EMG in the soleus muscle and in the anterior tibial muscle showed preinnervation and alternating activity after touch down. When hopping there was little preinnervation in the soleus muscle, and the activity was initiated about 45 ms after touch down by a peak and continued unbroken until lift off. In the drop jumps the EMG pattern depended on the jumping style used by the subject. 4. The H reflex in the soleus muscle was strongly modulated in a manner appropriate to the requirements of the motor task. During landing from a downward jump the H reflex was low at touch down whereas while hopping it was high at touch down. During drop jumping it was variable and influenced by the jumping technique. 5. Muscle stiffness in the ankle joint was negative after touch down when landing, but always positive when hopping. 6. It is suggested that during landing the alternating EMG pattern after touch down was programmed and little influenced by reflexes. During hopping reflexes could contribute to the initial peak and the EMG during lift off. 7. The programmed EMG activity and the suppression of the H reflex while landing probably contribute to the development of the negative stiffness and change the muscles from a spring to a damping unit." @default.
• W2097536892 created "2016-06-24" @default.
• W2097536892 creator A5050130585 @default.
• W2097536892 creator A5063660505 @default.
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• W2097536892 date "1991-06-01" @default.
• W2097536892 modified "2023-10-05" @default.
• W2097536892 title "Dynamic control of muscle stiffness and H reflex modulation during hopping and jumping in man." @default.
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• W2097536892 doi "https://doi.org/10.1113/jphysiol.1991.sp018596" @default.
• W2097536892 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1180048" @default.
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